> It seems Kazutaka YOKOTA wrote:
> >
> > AFAIK, not all video cards generate the vertical retrace interrupt.
> > Even worse, some BIOSes have a configuration option which instract the
> > BIOS NOT to assign an IRQ to the PCI video card.
> >
> > I fully agree that the vertical retrace interrupt will be of great
> > value, but I wonder if it is really worth the trouble, because it might
> > be available in only few cards and systems at the end of the day...
> >
> > Well, I may be wrong :-)
>
> Well, sortof :)
>
> The delay caused by the system to process the interrupt and deliver
> the signal etc is unpredictable (well sortof) and is almost certainly
> too long so the window of opportunity will be missed ...
>
> This has been discussed to death many times in the past for the
> mouse pointer updates etc etc...
>
Let me ask a different question: How does Microsoft's DirectX handle delivery
of vertical retrace interrupt?
--
Amancio Hasty
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